ENGINE, AND CONTROL DEVICE FOR ENGINE

• Main Author: TAKAGI AKIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 21.11.2019
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

To inhibit, in an engine equipped with a plurality of superchargers, when exhaust gas for driving the turbines of the respective superchargers flows in an exhaust passage by different routes and merges, exhaust temperature on an exhaust downstream side of the merging part to become excessively high.SOLUTION: In an engine 1 having an exhaust passage for flowing of exhaust gas, and superchargers 30, 40, the exhaust passage includes, from an exhaust upstream side towards an exhaust downstream side: a first exhaust path (an exhaust pipe 51); a branch part P1; a second exhaust path (exhaust pipes 52a, 52b) and a third path (exhaust pipes 53a, 53b), which are branched from the first exhaust path at the branch part P1; and a joining part P2 where the second exhaust path and the third exhaust path join with each other. A turbine 32 constituting the supercharger 30 is provided in the second exhaust path, and a turbine 42 constituting the supercharger 40 is provided in the third exhaust path. The heat radiation of the third exhaust path is higher than the heat radiation of the second exhaust path.SELECTED DRAWING: Figure 1 【課題】複数の過給機を備えるエンジンにおいて各過給機のタービンを駆動する排気ガスが異なる経路で排気通路を流れて合流するときにその合流部よりも排気下流側の排気温度が高くなり過ぎることを抑制する。【解決手段】排気ガスが流れる排気通路と、過給機３０及び４０とを備えるエンジン１において、排気通路は、排気上流側から排気下流側に向かって、第１排気路（排気管５１）と、分岐部Ｐ１と、分岐部Ｐ１で第１排気路から分岐した第２排気路（排気管５２ａ及び５２ｂ）及び第３排気路（排気管５３ａ及び５３ｂ）と、第２排気路及び第３排気路が合流する合流部Ｐ２とを含む。第２排気路には、過給機３０を構成するタービン３２が設けられ、第３排気路には、過給機４０を構成するタービン４２が設けられている。そして、第３排気路の放熱性は第２排気路の放熱性よりも高い。【選択図】図１